Stock+: means modifying the airbox for better flow (opening/drilling/etc.), but still uses the stock filter.

Modern: includes all sponge, Ram, Uni, K&N, etc., types.

Gauze: bellmouth filters often have a gauze mesh only.

None: open carb, but includes gauze if the gauze is so big it does not restrict air flow at all. (Ours pictured above does restrict flow a bit.)

Weather/altitude:

Are you at a higher altitude, temperature, or humidity than average, or lower? (Higher makes you run richer so your jetting will be leaner than others need. Lower means you would jet richer than others need.)

This does NOT mean you are running lean or rich. Anything like that can be added to the notes below.

Click on the headers to sort the table.

Make

Cyl.

Type

Exhaust

Carb

Main

Idle

Needle

Clip

Slide

Filter

Weather/Altitude

Notes

Lambretta

200cc+

stock Indian

tuned ScootRS

28/30mm

108

42

JJH

3

3.5

stock+

high

Lambretta

200cc+

Mugello

tuned Taffspeed

28/30mm

130

36

JJH

2

3.5

modern

low

Lambretta

200cc+

stock

sport Clubman

28/30mm

116

56

JJH

2

3.5

modern

low

Read

barrel is a taffspeed honda 205

Lambretta

200cc+

stock Indian

tuned NK

28/30mm

114

34

JJH

3

3.5

modern

-

Lambretta

200cc+

stock Indian

tuned ScootRS

28/30mm

114

32

JJH

3

3.5

modern

-

Lambretta

185cc+

SR

tuned ScootRS

24mm

108

34

other

1 top

3.5

modern

-

Lambretta

225cc+

TS1

tuned Scorpion

28/30mm

138

38

JJH

1 top

3.5

none

-

Lambretta

225cc+

TS1

tuned JL

28/30mm

148

38

JJK

3

3.5

gauze

-

Lambretta

185cc+

Mugello

tuned ScootRS

28/30mm

116

32

JJH

4

3.5

modern

-

Lambretta

200cc+

stock Indian

tuned other

28/30mm

120

32

JJH

2

3.5

none

-

Read

Exhaust is an original DJ.

Lambretta

185cc+

Mugello

sport Clubman

28/30mm

122

42

JJH

2

3.5

modern

-

Lambretta

225cc+

Rapido

sport Clubman

28/30mm

120

40

JJH

3

3.5

modern

-

Vespa

125cc+

Polini

sport Polini

24mm

100

42

JJH

2

3.5

gauze

-

Read

powerjet carb.

Lambretta

225cc+

Rapido

tuned Scorpion

28/30mm

144

46

JJH

3

3.5

none

-

Read

the cylinder is race tuned with casing transfers opened to match barrel, running slightly rich as running motor in

Lambretta

185cc+

SR

tuned PM

28/30mm

140

40

JJH

4

3.5

none

-

Read

SR barrel MB suzuki stage 5, AF crank ported bottom end

Lambretta

200cc+

stock Indian

tuned ScootRS

28/30mm

122

32

JJH

2

3.5

stock+

-

Lambretta

200cc+

stock Indian

tuned PM

28/30mm

120

40

JJH

1 top

3.5

modern

low

Read

high comp head

Vespa

200cc+

stock

tuned JL

28/30mm

130

48

JJH

3

3.5

modern

-

Lambretta

200cc+

stock Indian

stock

28/30mm

108

36

JJH

2

3.5

modern

low

Vespa

185cc+

stock

tuned ScootRS

28/30mm

130

34

JJH

3

3.5

modern

-

Vespa

165cc+

Malossi

tuned Taffspeed

24mm

126

50

JJH

3

3.5

stock

-

Lambretta

200cc+

stock Indian

tuned PM

28/30mm

108

34

N80F

3

3

stock

-

Vespa

175cc+

Pinasco

tuned JL

28/30mm

126

48

other

3

3.5

modern

-

Lambretta

185cc+

Mugello

sport Clubman

28/30mm

112

40

JJH

3

3.5

none

-

Read

have been running this up for 2yrs "motorway use for rallies" weather conditions sometimes need to weaken neadle by a notch

I put this carb on straight out of the box with a Polini 24mm Manifold (had to make a ring to match rubber boot) and ran bike strong with stock main and idle jets. I had to adjust the needle setting and air fuel mixture. Other than that the bike is running great!

Vespa

175cc+

T5

tuned JL

24mm

118

42

JJF

2

3.5

none

-

Vespa

175cc+

Polini

tuned JL

28/30mm

128

40

JJH

3

3.5

gauze

-

Read

Modified 177er Polini, with JL RZ Mark One, opened the fuel Tab to 2,8mm, The clear float bowl was leaking so it was fix with the Red Würth Silicone.

Lambretta

185cc+

Mugello

tuned ScootRS

28/30mm

112

36

JJH

3

3.5

gauze

-

Read

It still running in at 70 mph its amazing fast

Vespa

150cc+

Indian 5-port

sport Sito

24mm

108

32

JJH

3

3.5

modern

-

Lambretta

90cc+

Malossi

tuned other

24mm

118

42

JJH

3

3.5

gauze

-

Read

cilinder 50 cc minarellie

Vespa

175cc+

Polini

tuned JL

24mm

118

38

JJH

3

3.5

gauze

-

Read

I have an LML Reed Valve Motor With PKW 24 Carb. I like to Know the best put up for turing

Vespa

175cc+

Polini

tuned JL

24mm

120

38

JJH

3

3.5

none

-

Read

i have a lml with a polini 177 a pkw 24 and a JL exhaust help me put up the proper jettin for this motor at low atitud and tropical weather

Lambretta

200cc+

Mugello

tuned JL

28/30mm

124

36

JJH

3

3.5

modern

-

Vespa

150cc+

T5

tuned ScootRS

24mm

130

40

JJH

3

3.5

modern

high

Lambretta

125cc+

stock

tuned JL

28/30mm

100

30

JJH

3

3.5

stock

-

Lambretta

185cc+

SR

tuned NK

28/30mm

128

40

JJH

3

3.5

none

high

Lambretta

175cc+

stock

sport Clubman

24mm

108

34

JJF

1

3.5

modern

-

Lambretta

175cc+

SR

tuned ScootRS

28/30mm

118

34

JJH

3

3.5

stock+

-

Vespa

210cc+

Polini

stock

28/30mm

128

48

JJH

3

3.5

modern

-

Read

Is this configuration OK

Lambretta

225cc+

Rapido

tuned ScootRS

28/30mm

128

50

JJH

3

3.5

modern

-

Vespa

165cc+

Malossi

tuned Scorpion

24mm

134

50

JJH

3

3.5

modern

-

Lambretta

175cc+

SR

sport Clubman

24mm

110

38

JJF

1

3.5

stock+

-

Lambretta

175cc+

SR

sport Clubman

24mm

110

38

JJF

1

3.5

stock+

-

Vespa

150cc+

stock

sport Leo Vinci

24mm

120

48

JJH

3

3.5

stock+

-

Lambretta

200cc+

stock Indian

tuned ScootRS

28/30mm

122

46

JJH

2

3.5

gauze

-

Read

Have tried many idle jets but to it right at 2 turns out it was 45. Also needle probably a touch rich so will get a JJK.

Lambretta

225cc+

TS1

tuned ScootRS

28/30mm

136

38

JJH

2

3.5

none

-

Lambretta

200cc+

Mugello

sport Clubman

24mm

104

32

JJH

3

3.5

modern

-

Lambretta

200cc+

Mugello

sport Clubman

24mm

104

32

JJH

3

3.5

modern

-

Vespa

150cc+

stock

stock

24mm

150

54

JJH

3

3.5

modern

-

Vespa

150cc+

stock

stock

28/30mm

100

42

N80F

2

3.5

none

-

Read

no pick up but had marvelleous top speed

Vespa

175cc+

Pinasco

tuned JL

28/30mm

130

42

JJH

3

3.5

modern

-

Vespa

165cc+

Malossi

tuned ScootRS

28/30mm

120

44

JJH

3

3.5

modern

-

Vespa

150cc+

T5

tuned ScootRS

28/30mm

140

46

JJH

3

3.5

stock

-

Lambretta

185cc+

Deanspeed

tuned ScootRS

28/30mm

110

48

JJH

3

3.5

stock

-

Read

Cylinder intake and exhaust opened up for big bore but Standard porting for kit

Lambretta

200cc+

stock

tuned other

28/30mm

126

50

other

2

4

modern

-

Vespa

210cc+

Malossi

tuned ScootRS

28/30mm

130

46

JJH

3

3.5

modern

-

Read

Good with 128 main also. Watch for fuel line air pockets= starvation.

Vespa

150cc+

stock

stock

24mm

120

36

JJH

5

3.5

modern

-

Lambretta

175cc+

stock Indian

tuned Fresco

28/30mm

108

38

JJH

3

3.5

none

low

Vespa

200cc+

stock

tuned ScootRS

24mm

112

42

JJH

3

3.5

gauze

-

Read

runs sweet as a nut

Lambretta

200cc+

Rapido

sport Clubman

28/30mm

118

40

JJH

4

3.5

none

-

Read

running slightly rich

Lambretta

90cc+

stock

stock

24mm

110

30

JJH

3

3.5

stock

-

Lambretta

200cc+

Rapido

tuned Scorpion

28/30mm

132

42

JJH

3

3.5

modern

-

Lambretta

175cc+

stock

stock

24mm

120

40

JJH

3

3.5

stock

-

Lambretta

175cc+

stock Indian

stock

24mm

110

32

JJF

1

3.5

modern

-

Lambretta

175cc+

stock Indian

stock

24mm

110

32

JJF

1

3.5

modern

-

Lambretta

175cc+

Indian 5-port

stock

28/30mm

140

30

JJH

5

3.5

modern

-

Lambretta

175cc+

SR

sport Clubman

24mm

112

38

JJH

3

3.5

stock

high

Vespa

175cc+

Polini

stock

28/30mm

118

36

JJH

2

5

stock

-

Lambretta

175cc+

stock Indian

tuned PM

28/30mm

116

38

JJK

1

3.5

stock+

-

Read

Indian ported S4 steel Barrel. Did have 112 main jet in but was running lean. Upped main jet to 116. Runs a dream.